SCD8661 Rev F
❑Manufactured using Space Qualified RH137 die
❑Radiation performance
- Total dose: >100 krads(Si), Dose rate = 50 - 300 rads(Si)/s
- ELDRS: > 50 krads(Si), Dose rate = 0.01 rads(Si)/s
❑Thermal shutdown
❑Output voltage adjustable: -1.25V to -27V
❑3-Terminal
❑Output current: 1.5A
❑Voltage reference: -1.25V ±4%
❑Load regulation: 1.0% max
❑Line regulation: 0.05% max
❑Ripple rejection: >66dB
❑Packaging – Hermetic Ceramic
-SMD-0.5 Surface mount
- 3 Pads, .400"L x .296"W x .120"Ht
- Power package
- Weight - 2 gm max
❑Designed for aerospace and high reliability space applications
❑Aeroflex Plainview’s Radiation Hardness Assurance Plan is DLA Certified to MIL-PRF-38534, Appendix G.
DESCRIPTION
The Aeroflex Plainview VRG8661 consists of a Negative Adjustable (RH137) voltage regulator capable of supplying
1.5Amps over the output voltage range as defined under recommended operating conditions. The VRG8661 offers
excellent line and load regulation specifications and ripple rejection. Dropout (Vin - Vout) decreases at lower load
currents.
The VRG8661 serves a wide variety of applications including High Efficiency Linear Regulators, Post Regulators for
Switching Supplies, Constant Current Regulators, Battery Chargers and Microprocessor Supply.
The VRG8661 has been specifically designed to meet exposure to radiation environments and is configured for a
SMD-0.5 SMT power package. It is guaranteed operational from -55°C to +125°C. Available screened to
MIL-STD-883, the VRG8661 is ideal for demanding military and space applications.
FIGURE 1 – BLOCK DIAGRAM / SCHEMATIC
April 16, 2012
www.aeroflex.com/voltreg
Standard Products
FEATURES
1
V
IN
ADJ
V
OUT
3
2
RH137
Negative
Regulator
Radiation Tolerant
Standard Products
VRG8661
Adjustable Regulator
Negative
Voltage
2
SCD8661 Rev F 4/16/12 Aeroflex Plainview
ABSOLUTE MAXIMUM RATINGS
PARAMETER RANGE UNITS
Lead temperature (soldering 10 Sec) 300 °C
Input-Output Voltage Differential -30 VDC
ESD 2.000-3.999 1/KV
Operating Junction Temperature Range -55 to +150 °C
Storage Temperature Range -65 to +150 °C
1/ Meets ESD testing per MIL-STD-883, method 3015, Class 2
NOTICE: Stresses above those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. These are stress rating only;
functional operation beyond the "Operation Conditions" is not recommended and extended exposure beyond the "Operation Conditions"
may effect device reliability.
RECOMMENDED OPERATING CONDITIONS
PARAMETER RANGE UNITS
Output Voltage Range -1.25 to -27 VDC
Case Operating Temperature Range -55 to +125 °C
ELECTRICAL PERFORMANCE CHARACTERISTICS
Unless otherwise specified -55°C < TC < +125°C & (VIN-VOUT) = -5V, IOUT = 0.5A
PARAMETER SYM CONDITIONS (P PMAX)MIN MAX UNITS
Reference Voltage 1/ 5/VREF -3V < (VIN - VOUT) < VDIFF MAX, 10mA < IOUT < IMAX -1.200 -1.300 V
Line Regulation 1/ 2/-3V < (VIN - VOUT) < -27V, - 0.05 %/V
Load Regulation 1/ 2/
10mA < IOUT < IMAX, VOUT < -5V - 50 mV
10mA < IOUT < IMAX, VOUT > -5V - 1.0 %
Thermal Regulation
IOUT = 1.5A, (VIN - VOUT) = -13.3V,
20ms Pulse, 20W, TC = +25°C
- 0.02 %/W
Ripple Rejection VOUT = -10V, f = 120Hz, CADJ = 10µF 66 - dB
Adjustment Pin Current 1/IADJ - 100 µA
Adjustment Pin Current 1/
Change IADJ
10mA < IOUT < IMAX
-5µA
-3V < (VIN - VOUT) < -27V
Minimum Load Current 1/ 3/
IMIN
(VIN - VOUT) = -27V - 5
mA
(VIN - VOUT) < -10V - 3
Current Limit 1/ 4/
IMAX
(VIN - VOUT) < -15V 1.5 -
A
(VIN - VOUT) = -27V, TC = +25°C 0.24 -
Long Term Stability 3/TA = +125°C - 1 %
Thermal Resistance
(Junction to Case) 3/JC -3°C/W
Notes:
1/ Specification derated to reflect Total Dose exposure to 100 Krad (Si) @25°C.
2/ Regulation is measured at a constant junction temperature, using pulse testing with a low duty cycle. Changes in output voltage due to heating
effects are covered under the specification for thermal regulation. Measurements taken at the output lead must be adjusted for lead resistance.
3/ Not tested. Shall be guaranteed to the specified limits.
4/ Pulsed @ <10% duty cycle @ 25°C.
5/ Testing over 12 watts is not performed over + 25°C.
VOUT
VIN
VOUT
IOUT
VOUT
TIME
3
SCD8661 Rev F 4/16/12 Aeroflex Plainview
60
50
40
30
20
10
0 20 40 60 80 100 120 140
Case Temperature (°C)
0
Maximum Power
Dissipation
(Watts)
FIGURE 2 – MAXIMUM POWER vs CASE TEMPERATURE
The maximum Power dissipation is limited by the thermal shutdown function of the regulator chip in the VRG8661. The graph
above represents the achievable power before the chip shuts down. The line in the graph represents the maximum power
dissipation of the VRG8661 This graph is based on the maximum junction temperature of 150°C and a thermal resistance (JC) of
3°C/W.
4
SCD8661 Rev F 4/16/12 Aeroflex Plainview
VRG8661
VIN VOUT
ADJ
R1
R2
IADJ = 50µAVREF = 1.25V,
VOUT = -VREF (1+R2/R1) + (-IADJ x R2)
12
3
Adjustable Regulator
FIGURE 3 – TYPICAL APPLICATIONS
FIGURE 4 – TYPICAL CURRENT LIMIT
5
SCD8661 Rev F 4/16/12 Aeroflex Plainview
FIGURE 5– PACKAGE OUTLINE — SURFACE MOUNT
4X R.020
.405
MAX
.301
MAX
.127
MAX
.015
3 Places
.286
.005
.030
MIN
R.025 MAX
6 Places
.095
.030 MIN
.005
.005
2 Places
.120
.225
.150
23
2 Places
1
NOTES:
1. Package & Lid are electrically isolated from signal pads.
2. ESD symbol denotes Pin 1.
6
SCD8661 Rev F 4/16/12
EXPORT CONTROL: EXPORT WARNING:
This product is controlled for export under the International Traffic in
Arms Regulations (ITAR). A license from the U.S. Department of
State is required prior to the export of this product from the United
States.
Aeroflex’s military and space products are controlled for export under
the International Traffic in Arms Regulations (ITAR) and may not be
sold or proposed or offered for sale to certain countries. (See ITAR
126.1 for complete information.)
For detailed performance characteristic curves, applications information and typical applications see the latest
datasheet for their RH137, which is available on-line at www.linear.com.
Our passion for performance is defined by three
attributes represented by these three icons:
solution-minded, performance-driven and customer-focused
LT, LTC,
, Linear Technology and the Linear logo are registered trademarks and RH137 is copyright Linear Technology Corporation.
PLAINVIEW, NEW YORK
Toll Free: 800-THE-1553
Fax: 516-694-6715
SE AND MID-ATLANTIC
Tel: 321-951-4164
Fax: 321-951-4254
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Fax: 805-778-1980
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Tel: 949-362-2260
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Tel: 603-888-3975
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CENTRAL
Tel: 719-594-8017
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www.aeroflex.com info-ams@aeroflex.com
Aeroflex Microelectronic Solutions reserves the right to
change at any time without notice the specifications, design,
function, or form of its products described herein. All
parameters must be validated for each customer's application
by engineering. No liability is assumed as a result of use of
this product. No patent licenses are implied.
ORDERING INFORMATION
MODEL DLA SMD # SCREENING PACKAGE
VRG8661-7 - Commercial Flow, +25°C testing only
SMD-0.5
Power Pkg
VRG8661-S -
Military Temperature, -55°C to +125°C
Screened in accordance with the individual Test Methods
of MIL-STD-883 for Space Applications
VRG8661-201-1S 5962-0920602KXC
In accordance with DLA SMD
VRG8661-201-2S 5962-0920602KXA
VRG8661-901-1S 5962R0920602KXC In accordance with DLA Certified RHA Program Plan to RHA
Level "R", 100krads(Si)
VRG8661-901-2S 5962R0920602KXA
